P1507 on 2000-2011 Ford Ranger — Idle Air Control Underspeed Error
1 vehicles · 1 makes · $100-$450 repair
Most Reported On
P1507 is an OBD-II diagnostic trouble code meaning “Idle Air Control Underspeed Error.” This manufacturer-specific code (common on Ford, Lincoln, Mazda, Mercury) means the engine computer detected idle speed lower than the target the Idle Air Control (IAC) system is commanding. The IAC valve regulates air into the engine at idle to keep RPM steady; when the engine idles too low or stalls despite commands to raise it, this underspeed code sets. Symptoms include rough idle, low idle, or stalling at stops. It typically points to a dirty or failing IAC valve, a dirty throttle body, or a restriction in airflow. This code is most commonly reported on 2000-2011 Ford Ranger, with repair costs ranging from $100 to $450.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P1507, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does P1507 mean?
P1507 stands for "Idle Air Control Underspeed Error." This manufacturer-specific code (common on Ford, Lincoln, Mazda, Mercury) means the engine computer detected idle speed lower than the target the Idle Air Control (IAC) system is commanding. The IAC valve regulates air into the engine at idle to keep RPM steady; when the engine idles too low or stalls despite commands to raise it, this underspeed code sets. Symptoms include rough idle, low idle, or stalling at stops. It typically points to a dirty or failing IAC valve, a dirty throttle body, or a restriction in airflow.
What are the most common causes of P1507?
The most common causes of P1507 are: Dirty, sticking, or faulty idle air control (IAC) valve, Carbon-clogged throttle body or IAC passage, Restricted air intake or clogged air filter, Vacuum leak affecting idle control, Faulty PCV system, Wiring or connector fault at the IAC valve. The specific cause varies by vehicle.
How much does it cost to fix P1507?
Repair costs for P1507 range from $100 to $450, depending on the vehicle and root cause.
Which vehicles are affected by P1507?
Au7o has documented P1507 across 1 vehicle models from 1 manufacturers: Ford.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.